file以及⽂件⼤⼩转化问题android 获取⽂件夹、⽂件的⼤⼩以B、KB、MB、GB 为单位
public class FileSizeUtil {
public static final int SIZETYPE_B = 1;//获取⽂件⼤⼩单位为B的double值
public static final int SIZETYPE_KB = 2;//获取⽂件⼤⼩单位为KB的double值
public static final int SIZETYPE_MB = 3;//获取⽂件⼤⼩单位为MB的double值
public static final int SIZETYPE_GB = 4;//获取⽂件⼤⼩单位为GB的double值
/**
* 获取⽂件指定⽂件的指定单位的⼤⼩
* @param filePath ⽂件路径
* @param sizeType 获取⼤⼩的类型1为B、2为KB、3为MB、4为GB
* @return double值的⼤⼩
*/
public static double getFileOrFilesSize(String filePath,int sizeType){
File file=new File(filePath);
long blockSize=0;
try {
if(file.isDirectory()){
blockSize = getFileSizes(file);
}else{
blockSize = getFileSize(file);
}
} catch (Exception e) {
e.printStackTrace();
Log.e("获取⽂件⼤⼩","获取失败!");
}
return FormetFileSize(blockSize, sizeType);
}
/**
* 调⽤此⽅法⾃动计算指定⽂件或指定⽂件夹的⼤⼩
* @param filePath ⽂件路径
* @return 计算好的带B、KB、MB、GB的字符串
*/
public static String getAutoFileOrFilesSize(String filePath){
File file=new File(filePath);
long blockSize=0;
try {
if(file.isDirectory()){
blockSize = getFileSizes(file);
}else{
blockSize = getFileSize(file);
}
} catch (Exception e) {
e.printStackTrace();
Log.e("获取⽂件⼤⼩","获取失败!");
}
return FormetFileSize(blockSize);
}
/**
* 获取指定⽂件⼤⼩
* @param f
* @return
* @throws Exception
*/
private static long getFileSize(File file) throws Exception
{
long size = 0;
if (ists()){
FileInputStream fis = null;
fis = new FileInputStream(file);
size = fis.available();
}
else{
Log.e("获取⽂件⼤⼩","⽂件不存在!");
}
return size;
}
/**
* 获取指定⽂件夹
* @param f
* @return
* @throws Exception
*/
private static long getFileSizes(File f) throws Exception
{
long size = 0;
File flist[] = f.listFiles();
for (int i = 0; i < flist.length; i++){
inputtypefile不上传文件if (flist[i].isDirectory()){
size = size + getFileSizes(flist[i]);
}
else{
size =size + getFileSize(flist[i]);
}
}
return size;
}
/**
* 转换⽂件⼤⼩
* @param fileS
* @return
*/
private static String FormetFileSize(long fileS)
{
DecimalFormat df = new DecimalFormat("#.00");
String fileSizeString = "";
String wrongSize="0B";
if(fileS==0){
return wrongSize;
}
if (fileS < 1024){
fileSizeString = df.format((double) fileS) + "B";
}
else if (fileS < 1048576){
fileSizeString = df.format((double) fileS / 1024) + "KB";
}
else if (fileS < 1073741824){
fileSizeString = df.format((double) fileS / 1048576) + "MB";
}
else{
fileSizeString = df.format((double) fileS / 1073741824) + "GB";  }
return fileSizeString;
}
/**
* 转换⽂件⼤⼩，指定转换的类型
* @param fileS
* @param sizeType
* @return
*/
private static double FormetFileSize(long fileS,int sizeType)
{
DecimalFormat df = new DecimalFormat("#.00");
double fileSizeLong = 0;
switch (sizeType) {
case SIZETYPE_B:
fileSizeLong=Double.valueOf(df.format((double) fileS));
break;
case SIZETYPE_KB:
fileSizeLong=Double.valueOf(df.format((double) fileS / 1024)); break;
case SIZETYPE_MB:
fileSizeLong=Double.valueOf(df.format((double) fileS / 1048576)); break;
case SIZETYPE_GB:
fileSizeLong=Double.valueOf(df.format((double) fileS / 1073741824)); break;
default:
break;
}
return fileSizeLong;
}